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- Title
软土深基坑被动区超前加固变形控制效果研究.
- Authors
于至海; 吴旭君; 曹文昭
- Abstract
Based on a practical project, three kinds of finite difference numerical models with different stratum parameters were established by using FLAC 3D software. It was verified that the hardening model was more suitable than the Mohr-Coulomb model in foundation pit engineering, and the effect of skirt edge reinforcement and full pit bottom reinforcement was explored. Besides, based on the idea of passive zone reinforcement at the bottom of foundation pits, advanced reinforcement of excavation section in deep foundation pits in soft soil was proposed to control the deformation of retaining structure. The results show that the hardening model is more suitable than the Mohr-Coulomb model in foundation pit engineering. The reasonable reinforcement width of skirt edge reinforcement is 0.5h(h is the excavation depth), and the reasonable reinforcement depth is closely related to the stratum conditions at the bottom of the pit. The reasonable reinforcement depth of the full pit bottom reinforcement is 0.3h. In some cases where the displacement of the foundation pit is strictly controlled, when the reinforcement depth is more than 0.5h, reinforcement priority can be given to the soil between the last brace and the bottom of the pit. The full pit bottom reinforcement can make the position of the first brace move down, which provides a feasible scheme to reduce the number of braces. This study provides a reference for similar engineering design and further enriches the control measures of deep foundation pit deformation in soft soil area.
- Subjects
BORED piles; BUILDING foundations; ENGINEERING design; SOIL mechanics; FINITE differences; LONGWALL mining
- Publication
Journal of Architecture & Civil Engineering, 2021, Vol 38, Issue 6, p71
- ISSN
1673-2049
- Publication type
Article
- DOI
10.19815/j.jace.2021.08056